Method and system for analyzing durability of planetary mechanism of drum-type coal mining machine

Abstract

The invention discloses a durability analysis method and system for a planetary mechanism of a drum-type coal mining machine, and the method comprises the steps: carrying out the mesh generation of a three-dimensional model of the planetary mechanism of the coal mining machine, and obtaining a network model of the planetary mechanism; importing the three-way force and the three-phase torque curve borne by the planetary mechanism and the grid model of the planetary mechanism into finite element analysis software for finite element analysis, and extracting a stress analysis result of the planetary mechanism in a working state; and importing the stress analysis result into durability simulation analysis software, and carrying out durability analysis on the planetary mechanism. The invention provides a durability analysis method and system for a planetary mechanism of a drum-type coal mining machine, and the method achieves the establishment of a durability simulation model of the planetary mechanism in the drum-type coal mining machine, gives full consideration to the load and driving load borne by the planetary mechanism when a coal mining machine drum cuts a coal seam, and improves the durability of the planetary mechanism. And carrying out durability simulation analysis to evaluate the durability life.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mining equipment, and in particular relates to a durability analysis method and system for a planetary mechanism of a drum-type coal mining machine. Background Art

[0002] Drum shearer is a key equipment for mechanized coal mining. It is a typical large-scale complex electromechanical and hydraulic system product that directly determines the efficiency and cost of coal mining. It has the characteristics of high power, large mass, and high output. It accounts for more than 90% of all mechanized coal mining equipment. The planetary mechanism is a key component of the cutting part of the coal mining machine. The coal mining machine in the condition of coal seams containing interbedded gangue has harsh working conditions and complex loads. The key parts of the planetary mechanism in the cutting part are subjected to very large torque. The coal seam occurrence conditions, the kinematic parameters of the coal mining machine and the structural characteristics of its various parts have a direct impact on its fatigue life. The key parts of the planetary mechanism such as the planetary mechanism and the planetary shaft working under harsh working conditions may suffer fatigue failure, affecting the reliability of the coal mining machine.

[0003] At present, there are mainly the following methods for durability analysis of planetary mechanisms: 1. Use the existing calculation formula to calculate the working load of the drum and the driving load of the drive transmission, and then calculate the durability life according to the reliability calculation formula of the planetary mechanism. This method involves many parameters, and the parameter value range is large, which will inevitably produce large human errors. 2. Use physical experiment methods for actual measurement or physical measurement methods. The physical measurement method requires the establishment of a coal mining machine loading test bench, the manufacture of the entire cutting system for testing, the purchase of corresponding sensors, and the connection of test circuits. Due to the actual physical experiment, the coal wall is a mixture of cement and sand in a certain proportion, and after solidification, it forms a coal wall with a certain strength, which is quite time-consuming, laborious and uneconomical. 3. Use the finite element analysis software LS-DYNA to simulate the load of the coal mining machine drum, and then combine the finite element software ANSYS to calculate the force analysis of the entire coal mining machine cutting system. The material of coal in LS-DYNA is viscoelastic-plastic material, and the unit will be automatically removed after failure. Therefore, it can only reflect the load of the cutting force on the drum. For the cut coal, since it is automatically removed, it cannot reflect the influence of the coal loading reaction force on the spiral drum. In addition, the use of ANSYS to calculate the entire cutting system will lead to excessive calculation amount and long calculation time, and a large amount of unnecessary result data will be calculated, resulting in a waste of computing resources. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a durability analysis method and system for the planetary mechanism of a drum-type coal mining machine. The method realizes the establishment of a durability simulation model of the planetary mechanism in the drum-type coal mining machine, fully considering the load and driving load (three-dimensional force and three-dimensional moment) borne by the planetary mechanism when the coal mining machine drum cuts the coal seam, and then performs durability simulation analysis to evaluate its durability life.

[0005] The object of the present invention is achieved through such a solution. On the one hand, the present invention provides a durability analysis method for a planetary mechanism of a drum coal mining machine, comprising:

[0006] Meshing the three-dimensional model of the planetary mechanism of the coal mining machine to obtain a network model of the planetary mechanism;

[0007] Import the three-dimensional forces and three-phase torques on the coal mining machine drum, the three-dimensional forces and three-phase torque curves on the planetary mechanism, and the grid model of the planetary mechanism into the finite element analysis software for finite element analysis, and extract the force analysis results of the planetary mechanism in the working state;

[0008] The force analysis results are imported into durability simulation analysis software to perform durability analysis on the planetary mechanism.

[0009] Furthermore, the three-directional forces and three-phase torque curves on the drum are obtained from a discrete element model of the coal mining machine drum cutting the coal wall.

[0010] Furthermore, the specific steps of obtaining the three-direction force and three-phase moment curves of the drum from the discrete element model of the coal mining machine drum cutting the coal wall include:

[0011] Establish a coal wall model based on the mechanical properties parameters of coal rock;

[0012] Converting the three-dimensional solid model of the drum into the IGES format, and then importing the three-dimensional solid model of the drum into the coal wall model to obtain a discrete element simulation model of the coal mining machine drum cutting the coal wall;

[0013] The coal shearer drum cutting coal wall discrete element simulation model is used to simulate the coal shearer cutting coal wall, and the three-axis force and three-phase torque curves of the coal shearer drum are extracted.

[0014] Furthermore, the three-directional forces and three-phase torque curves acting on the planetary mechanism are obtained from the driving dynamics model of the coal mining machine cutting system.

[0015] Furthermore, the specific steps of obtaining the three-direction force and three-phase torque curves of the planetary mechanism from the driving dynamics model of the coal mining machine cutting system include:

[0016] The three-dimensional solid model of the coal mining machine drive motor, planetary mechanism and gear transmission system, as well as the drive parameters of the drive motor are input into the dynamic analysis software to construct a multi-body dynamic simulation model of the drive motor, planetary mechanism and gear transmission system;

[0017] The three-directional forces and three-phase torque curves acting on the planetary mechanism are extracted through simulation calculation.

[0018] Furthermore, the durability analysis method also includes obtaining mechanical property parameters of coal rock, and obtaining structural parameters and mechanical property parameters of coal mining machine parts; wherein,

[0019] The mechanical property parameters of the coal rock are used to establish a coal wall model;

[0020] The structural parameters and mechanical performance parameters of the coal mining machine parts are used to establish a three-dimensional solid model of the coal mining machine parts.

[0021] Further, the mechanical property parameters of the coal rock include one or more of density, natural water content, tensile strength, compressive strength, firmness coefficient, elastic modulus, Poisson's ratio, cohesion, friction angle, failure surface shape parameter, adhesion and expansion angle;

[0022] The mechanical performance parameters of the coal mining machine parts include elastic model, Poisson's ratio, density, shear modulus and connection parameters between parts.

[0023] Further, the durability analysis of the planetary mechanism specifically includes:

[0024] Establish a fatigue analysis process for planetary mechanisms;

[0025] Calculate fatigue life of planetary mechanisms;

[0026] The fatigue strength of the planetary mechanism is simulated and evaluated based on the simulation results.

[0027] Furthermore, Hypermesh is used to mesh the three-dimensional model of the planetary mechanism of the coal mining machine; ANSYS is used as the finite element analysis software; nCode is used as the durability simulation analysis software; EDEM is used to construct the discrete element model of the coal wall; and ADAMS is used as the dynamic analysis software.

[0028] On the other hand, the present invention also provides a planetary mechanism durability analysis system for a drum type coal mining machine, comprising:

[0029] A meshing module, used for meshing the three-dimensional model of the planetary mechanism of the coal mining machine to obtain a network model of the planetary mechanism;

[0030] A finite element analysis module is used to import the three-dimensional force and three-phase torque of the coal mining machine drum, the three-dimensional force and three-phase torque curves of the planetary mechanism and the grid model of the planetary mechanism into the finite element analysis software for finite element analysis, and extract the force analysis results of the planetary mechanism in the working state;

[0031] The durability analysis module is used to import the force analysis results into the durability simulation analysis software to perform durability analysis on the planetary mechanism.

[0032] Beneficial effects:

[0033] The present invention provides a durability analysis method and system for the planetary mechanism of a drum-type coal mining machine. The method realizes the establishment of a durability simulation model of the planetary mechanism in the drum-type coal mining machine, fully considering the load and drive load borne by the planetary mechanism when the coal mining machine drum cuts the coal seam, and then performs durability simulation analysis to evaluate its durability life.

[0034] The present invention provides a durability analysis method for the planetary mechanism of a drum-type coal mining machine. The discrete element model of the coal wall is constructed by EDEM software to obtain the load on the drum of the coal mining machine, thereby inferring the comprehensive load on the planetary mechanism. The method can accurately calculate the comprehensive load of the coal mining machine during the cutting process and the coal block transportation process; then the multi-body dynamics model of the cutting system is constructed using ADAMS software to calculate the driving load of the planetary mechanism. Compared with the full-flexible simulation calculation, this method can efficiently calculate the loaded driving load; then the planetary mechanism is professionally meshed using Hypermesh, the above load is applied to the planetary mechanism for finite element evaluation in ANSYS, and finally the durability life evaluation is performed in nCode software.

[0035] The present invention provides a planetary mechanism durability analysis method and system for a drum coal mining machine. Compared with calculating the durability life using empirical formulas, the method and system can greatly reduce errors caused by factors such as too many parameters and a large parameter range. Compared with actual measurements or physical measurements using physical experiments, the present invention can greatly reduce equipment costs and time costs caused by experiments. Compared with using LS-DYNA to simulate the load of the coal mining machine drum and ANSYS to calculate the force analysis method of the entire coal mining machine cutting system, the present invention can greatly improve calculation accuracy and reduce calculation time, and reduce the waste of computing resources.

[0036] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0038] Figure 1 This is a flow chart of a durability analysis method for a planetary mechanism of a drum-type coal mining machine according to an embodiment of the present invention;

[0039] Figure 2 The multi-body dynamics simulation model diagram of the coal mining machine is constructed in order to import the motor, planetary reducer and transmission gear set into ADAMS through the three-dimensional intermediate format stp;

[0040] Figure 3 This is a discrete element coal wall model diagram established using EDEM software based on the mechanical properties of the coal wall.

[0041] Figure 4 It is the three-dimensional vector reasonable curve diagram of the spiral drum of the coal mining machine cutting the coal wall;

[0042] Figure 5 To obtain the speed curve diagram of the entire transmission system and planetary reducer;

[0043] Figure 6 This is a schematic diagram of the transient dynamics simulation results of the planetary reducer;

[0044] Figure 7 Schematic diagram of the planetary reducer fatigue life simulation results. DETAILED DESCRIPTION

[0045] The present invention is further described below in conjunction with specific implementation methods. The accompanying drawings are only used for exemplary descriptions and are only schematic diagrams, not actual drawings, and cannot be understood as limiting this patent; in order to better illustrate the embodiments of the present invention, some parts of the accompanying drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the accompanying drawings may be omitted.

[0046] like Figure 1-7 As shown, the object of the present invention is achieved through such a solution. On the one hand, the present invention provides a durability analysis method for a planetary mechanism of a drum coal mining machine, comprising:

[0047] S110, meshing the three-dimensional model of the planetary mechanism of the coal mining machine to obtain a network model of the planetary mechanism;

[0048] S120, importing the three-dimensional forces and three-phase torques on the coal mining machine drum, the three-dimensional forces and three-phase torque curves on the planetary mechanism, and the mesh model of the planetary mechanism into finite element analysis software for finite element analysis, and extracting the force analysis results of the planetary mechanism in a working state;

[0049] S130, importing the force analysis result into durability simulation analysis software to perform durability analysis on the planetary mechanism.

[0050] The present invention provides a durability analysis method and system for the planetary mechanism of a drum-type coal mining machine. The method realizes the establishment of a durability simulation model of the planetary mechanism in the drum-type coal mining machine, fully considering the load and drive load borne by the planetary mechanism when the coal mining machine drum cuts the coal seam, and then performs durability simulation analysis to evaluate its durability life.

[0051] As a specific embodiment, the three-axis force and three-phase torque curves of the drum are obtained from a discrete element model of the coal mining machine drum cutting the coal wall.

[0052] As a specific embodiment, the specific steps of obtaining the three-direction force and three-phase torque curves of the drum from the discrete element model of the coal mining machine drum cutting the coal wall include:

[0053] Establish a coal wall model based on the mechanical properties parameters of coal rock;

[0054] Converting the three-dimensional solid model of the drum into the IGES format, and then importing the three-dimensional solid model of the drum into the coal wall model to obtain a discrete element simulation model of the coal mining machine drum cutting the coal wall;

[0055] The coal shearer drum cutting coal wall discrete element simulation model is used to simulate the coal shearer cutting coal wall, and the three-axis force and three-phase torque curves of the coal shearer drum are extracted.

[0056] The present invention provides a durability analysis method for the planetary mechanism of a drum-type coal mining machine. The discrete element model of the coal wall is constructed by EDEM software to obtain the load on the drum of the coal mining machine, thereby inferring the comprehensive load on the planetary mechanism. The method can accurately calculate the comprehensive load of the coal mining machine during the cutting process and the coal block transportation process; then the multi-body dynamics model of the cutting system is constructed using ADAMS software to calculate the driving load of the planetary mechanism. Compared with the full-flexible simulation calculation, this method can efficiently calculate the loaded driving load; then the planetary mechanism is professionally meshed using Hypermesh, the above load is applied to the planetary mechanism for finite element evaluation in ANSYS, and finally the durability life evaluation is performed in nCode software.

[0057] As a specific embodiment, the three-directional forces and three-phase torque curves acting on the planetary mechanism are obtained from the driving dynamics model of the coal mining machine cutting system.

[0058] As a specific embodiment, the specific steps of obtaining the three-direction force and three-phase torque curves of the planetary mechanism from the driving dynamics model of the coal mining machine cutting system include:

[0059] The three-dimensional solid model of the coal mining machine drive motor, planetary mechanism and gear transmission system, as well as the drive parameters of the drive motor are input into the dynamic analysis software to construct a multi-body dynamic simulation model of the drive motor, planetary mechanism and gear transmission system;

[0060] The three-directional forces and three-phase torque curves acting on the planetary mechanism are extracted through simulation calculation.

[0061] As a specific embodiment, the durability analysis method further includes obtaining mechanical property parameters of coal rock, and obtaining structural parameters and mechanical property parameters of coal mining machine parts; wherein,

[0062] The mechanical property parameters of the coal rock are used to establish a coal wall model;

[0063] The structural parameters and mechanical performance parameters of the coal mining machine parts are used to establish a three-dimensional solid model of the coal mining machine parts.

[0064] As a specific embodiment, the mechanical property parameters of the coal rock include one or more of density, natural water content, tensile strength, compressive strength, firmness coefficient, elastic modulus, Poisson's ratio, cohesion, friction angle, failure surface shape parameter, adhesion and expansion angle;

[0065] The mechanical performance parameters of the coal mining machine parts include elastic model, Poisson's ratio, density, shear modulus and connection parameters between parts.

[0066] As a specific embodiment, the durability analysis of the planetary mechanism specifically includes:

[0067] Establish a fatigue analysis process for planetary mechanisms;

[0068] Calculate fatigue life of planetary mechanisms;

[0069] The fatigue strength of the planetary mechanism is simulated and evaluated based on the simulation results.

[0070] As a specific embodiment, Hypermesh is used to mesh the three-dimensional model of the planetary mechanism of the coal mining machine; ANSYS is used as the finite element analysis software; nCode is used as the durability simulation analysis software; EDEM is used to construct the discrete element model of the coal wall; and ADAMS is used as the dynamic analysis software.

[0071] The present invention provides a planetary mechanism durability analysis method and system for a drum coal mining machine. Compared with calculating the durability life using empirical formulas, the method and system can greatly reduce errors caused by factors such as too many parameters and a large parameter range. Compared with actual measurements or physical measurements using physical experiments, the present invention can greatly reduce equipment costs and time costs caused by experiments. Compared with using LS-DYNA to simulate the load of the coal mining machine drum and ANSYS to calculate the force analysis method of the entire coal mining machine cutting system, the present invention can greatly improve calculation accuracy and reduce calculation time, and reduce the waste of computing resources.

[0072] like Figure 1-7 As shown, on the other hand, the present invention also provides a planetary mechanism durability analysis system for a drum type coal mining machine, comprising:

[0073] A meshing module, used for meshing the three-dimensional model of the planetary mechanism of the coal mining machine to obtain a network model of the planetary mechanism;

[0074] A finite element analysis module, used for importing the three-axis force and three-phase torque curves of the planetary mechanism and the grid model of the planetary mechanism into the finite element analysis software for finite element analysis, and extracting the force analysis results of the planetary mechanism in the working state;

[0075] The durability analysis module is used to import the force analysis results into the durability simulation analysis software to perform durability analysis on the planetary mechanism.

[0076] like Figure 1-7 As shown, in general, the durability analysis method of the planetary mechanism of a drum coal mining machine provided by the present invention includes constructing a discrete element model of the coal mining machine drum cutting the coal wall, constructing a driving dynamics model of the coal mining machine cutting system, and constructing a comprehensive load finite element model of the planetary mechanism and its durability simulation model.

[0077] The premise of model construction is to obtain the mechanical properties parameters of coal rock and the structural parameters and mechanical properties parameters of coal mining machine. The mechanical properties parameters of coal rock include: coal rock density, natural water content of coal rock, tensile strength of coal rock, compressive strength of coal rock, solidity coefficient of coal rock, elastic modulus of coal rock, Poisson's ratio of coal rock, cohesion of coal rock, and internal friction angle of coal rock. The structural parameters of coal mining machine use 3D software to establish the 3D solid model of each component of coal mining machine, and then assemble it into a 3D solid assembly model of coal mining machine. The mechanical properties parameters of coal mining machine include shear modulus, density, Poisson's ratio of each component and connection parameters between components.

[0078] (1) Construct a discrete element model of the coal mining machine drum cutting the coal wall, the purpose of which is to obtain the load on the coal mining machine drum, so as to infer the comprehensive load on the planetary mechanism. Compared with simulating the load of the coal mining machine drum by LS-DYNA, this method can accurately calculate the comprehensive load of the coal mining machine during the cutting process and the coal block transportation process. The specific method is: first, according to the mechanical properties of coal rock, the coal wall model is established by using EDEM, then the three-dimensional solid model of the drum is converted into IGES format, and the three-dimensional solid model of the drum is imported into the established coal wall model, and the discrete element simulation model of the coal mining machine drum cutting the coal wall is established. According to the working conditions, the speed of the coal mining machine spiral drum is set to 58r / min and the traction speed is set to 10m / min, and the fixed time step is set to 20% in EDEM, the target storage time interval is set to 0.01s, and the grid size is 5 times the minimum particle radius. After the simulation, the comprehensive load of the drum (three-axis force and three-phase torque curve), that is, the load of the planetary mechanism (three-axis force and three-phase torque curve) is extracted.

[0079] (2) Construct the driving dynamics model of the coal mining machine cutting system, the purpose of which is to obtain the driving load on the planetary mechanism in the coal mining machine. Compared with the force analysis method of directly calculating the entire coal mining machine cutting system through ANSYS, it can greatly improve the calculation accuracy and reduce the calculation time, and reduce the waste of computing resources. The specific construction method is: first, the three-dimensional solid model of the drive motor, planetary mechanism and gear transmission system and the driving parameters of the drive motor are imported into the ADAMS software, and a multi-body dynamics simulation model of the drive motor, planetary mechanism and gear transmission system is established. The three-dimensional force and three-phase torque curve of the input side of the planetary mechanism, that is, the driving load (three-dimensional force and three-phase torque curve) are extracted through simulation calculation.

[0080] (3) Construct a comprehensive load finite element model of the planetary mechanism and its durability simulation model, the purpose of which is to obtain the fatigue life of the planetary mechanism in the coal mining machine in order to evaluate the durability of the planetary mechanism. The specific construction method is: first, import the three-dimensional model of the planetary mechanism into the Hypermesh software for meshing, then import the planetary mechanism mesh model into the finite element analysis software ANSYS, and then import the three-dimensional force and three-phase torque curves of the planetary mechanism and the three-dimensional force and three-phase torque curves of the input side of the planetary mechanism into ANSYS for finite element analysis, extract the force analysis of the planetary mechanism under the working state, and then use the interface between the finite element analysis software ANSYS and the durability simulation analysis software nCode to import the obtained force analysis results of the planetary mechanism under the working state into nCode, and build a fatigue analysis process to calculate its fatigue life. Evaluate the fatigue strength of the planetary mechanism based on the simulation results.

[0081] Next, a durability analysis method and system for a planetary mechanism of a drum-type coal mining machine provided by the present invention will be specifically described through specific embodiments.

[0082] This specific implementation case provides a planetary mechanism durability analysis method for a drum-type coal mining machine, the coal mining machine model used is MG1000 / 2500-WD, and the mechanical performance parameters of the coal rock and the coal mining machine are shown in Table 1 and Table 2. The planetary mechanism analysis method includes the following steps:

[0083] Elastic modulus Poisson's ratio density 4.6e11Pa 0.3 <![CDATA[7800kg·m -3 ]]>

[0084] Table 1 Coal mining machine material parameters

[0085]

[0086] Table 2 Coal and rock material parameters

[0087] (1) Obtain the mechanical properties parameters of the coal mining machine and coal rock, where the mechanical properties parameters of the coal mining machine include elastic model, Poisson's ratio and density, and the mechanical properties parameters of the coal rock include elastic modulus, Poisson's ratio, density, failure surface shape parameters, friction angle, adhesion and expansion angle, as shown in Tables 1 and 2.

[0088] (2) According to the structural parameters of the coal mining machine, UG software is used to establish the three-dimensional solid model of each component of the coal mining machine, such as the motor, planetary reducer, spiral drum, transmission gear set, etc., and then the various components are assembled into a three-dimensional solid assembly model of the coal mining machine; and the motor, planetary reducer, and transmission gear set are imported into ADAMS through the three-dimensional intermediate format STP to construct a multi-body dynamics simulation model of the coal mining machine, such as Figure 2 shown.

[0089] (3) According to the mechanical properties of coal and rock, a discrete element coal wall model is established using EDEM software; Figure 3 As shown in the figure, the specific method is as follows: according to the data in Table 2 and the discrete element theory, the parameters of the Hertz-Mindlin with bonding model of coal and coal are calibrated, and the parameters of the Hertz-Mindlin with bonding model include normal stiffness, tangential stiffness, normal stress, and tangential stress; after setting the shear modulus, density, Poisson's ratio, dynamic friction coefficient, static friction coefficient, recovery coefficient, and the number of parameters of the Hertz-Mindlin with bonding model of coal and coal in the discrete element software EDEM, the coal wall model is established by the fast filling method; Figure 2 This is a model of a coal wall. The material settings of the coal are displayed in vector form, and the particle settings of the inclusions are displayed as spheres.

[0090] (4) Import the three-dimensional solid model of the shearer spiral drum into hypermesh for mesh division, and export the mesh model of the shearer spiral drum into the stl format containing the mesh, and import the file into the coal wall model to establish a discrete element simulation of the shearer spiral drum cutting the coal wall. According to the working conditions, the speed of the shearer spiral drum is set to 2.77 rad / s, the traction speed is set to 0.26 m / s, and the fixed time length is set to 1e-6 in EDEM, and the Mubai storage time is set to 0.01s. Then perform the simulation. After the simulation, extract the three-dimensional force and three-phase torque curves of the shearer spiral drum Figure 4 A reasonable three-dimensional vector curve diagram of the spiral drum of the coal mining machine cutting the coal wall is provided.

[0091] (5) The three-way force and three-phase torque of the spiral drum of the coal mining machine are imported into the multi-body dynamics simulation model of the coal mining machine in the form of splines for simulation. The input side motor is applied with 1483 rpm, the simulation time is set to 5 s, and the number of simulation steps is set to 2000. The speed curve of the planetary reducer at the entire transmission system level is obtained. Figure 5 shown.

[0092] (6) Import the planetary reducer into the hypermesh software for fine mesh division, transfer the divided mesh model to ANSYS through the intermediate format bdf file for flexible simulation, and add all the external loads of the planetary reducer extracted in step 5, including the applied speed, torque, etc., to the ANSYS simulation for transient dynamic simulation. Figure 6 The transient dynamics simulation results of the planetary reducer are shown.

[0093] (7) Finally, the transient dynamics simulation of the planetary reducer is transferred through the interface between ANSYS and nCode software, and the life calculation and evaluation are performed in nCode fatigue life simulation software, as shown in detail. Figure 7 The fatigue life simulation results of the planetary reducer are shown.

[0094] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A durability analysis method for a planetary mechanism of a drum coal mining machine, characterized in that: include: Meshing the three-dimensional model of the planetary mechanism of the coal mining machine to obtain a network model of the planetary mechanism; Import the three-dimensional force and three-phase torque of the coal mining machine drum, the three-dimensional force and three-phase torque curve of the planetary mechanism and the grid model of the planetary mechanism into the finite element analysis software for finite element analysis, and extract the force analysis results of the planetary mechanism in the working state; The force analysis results are imported into durability simulation analysis software to perform durability analysis on the planetary mechanism.

2. The durability analysis method according to claim 1, characterized in that: The three-directional forces and three-phase torque curves on the drum are obtained from the discrete element model of the coal mining machine drum cutting the coal wall.

3. The durability analysis method according to claim 2, characterized in that: The specific steps of obtaining the three-direction force and three-phase moment curve of the drum from the discrete element model of the coal mining machine drum cutting the coal wall include: Establish a coal wall model based on the mechanical properties parameters of coal rock; Converting the three-dimensional solid model of the drum into the IGES format, and then importing the three-dimensional solid model of the drum into the coal wall model to obtain a discrete element simulation model of the coal mining machine drum cutting the coal wall; The coal shearer drum cutting coal wall discrete element simulation model is used to simulate the coal shearer cutting coal wall, and the three-axis force and three-phase torque curves of the coal shearer drum are extracted.

4. The durability analysis method according to claim 1, characterized in that: The three-direction forces and three-phase torque curves of the planetary mechanism are obtained from the driving dynamics model of the coal mining machine cutting system.

5. The durability analysis method according to claim 4, characterized in that: The specific steps of obtaining the three-direction force and three-phase torque curves of the planetary mechanism from the driving dynamics model of the coal mining machine cutting system include: The three-dimensional solid model of the coal mining machine drive motor, planetary mechanism and gear transmission system, as well as the drive parameters of the drive motor are input into the dynamic analysis software to construct a multi-body dynamic simulation model of the drive motor, planetary mechanism and gear transmission system; The three-directional forces and three-phase torque curves acting on the planetary mechanism are extracted through simulation calculation.

6. The durability analysis method according to any one of claims 1 to 5, characterized in that: It also includes obtaining the mechanical properties parameters of coal and rock, and obtaining the structural parameters and mechanical properties parameters of coal mining machine parts; among them, The mechanical property parameters of the coal rock are used to establish a coal wall model; The structural parameters and mechanical performance parameters of the coal mining machine parts are used to establish a three-dimensional solid model of the coal mining machine parts.

7. The durability analysis method according to claim 6, characterized in that: The mechanical property parameters of the coal rock include one or more of density, natural water content, tensile strength, compressive strength, firmness coefficient, elastic modulus, Poisson's ratio, cohesion, friction angle, failure surface shape parameter, adhesion and expansion angle; The mechanical performance parameters of the coal mining machine parts include elastic model, Poisson's ratio, density, shear modulus and connection parameters between parts.

8. The durability analysis method according to claim 6, characterized in that: The durability analysis of the planetary mechanism specifically includes: Establish a fatigue analysis process for planetary mechanisms; Calculate fatigue life of planetary mechanisms; The fatigue strength of the planetary mechanism is simulated and evaluated based on the simulation results.

9. The durability analysis method according to claim 6, characterized in that: Hypermesh is used to mesh the three-dimensional model of the planetary mechanism of the coal mining machine; ANSYS is used as the finite element analysis software; nCode is used as the durability simulation analysis software; EDEM is used to construct the discrete element model of the coal wall; and ADAMS is used as the dynamic analysis software.

10. A planetary mechanism durability analysis system for a drum-type coal mining machine, characterized in that: include: A meshing module, used for meshing the three-dimensional model of the planetary mechanism of the coal mining machine to obtain a network model of the planetary mechanism; A finite element analysis module is used to import the three-dimensional force and three-phase torque of the coal mining machine drum, the three-dimensional force and three-phase torque curves of the planetary mechanism and the grid model of the planetary mechanism into the finite element analysis software for finite element analysis, and extract the force analysis results of the planetary mechanism in the working state; The durability analysis module is used to import the force analysis results into the durability simulation analysis software to perform durability analysis on the planetary mechanism.

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